20021123223 has 6 divisors (see below), whose sum is σ = 28919400224. Its totient is φ = 13347415476.

The previous prime is 20021123219. The next prime is 20021123263. The reversal of 20021123223 is 32232112002.

20021123223 is a `hidden beast` number, since 200 + 211 + 232 + 23 = 666.

It is not a de Polignac number, because 20021123223 - 2² = 20021123219 is a prime.

It is a super-2 number, since 2×20021123223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021123196 and 20021123205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021123263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112284615 + ... + 1112284632.

Almost surely, 2^20021123223 is an apocalyptic number.

20021123223 is a deficient number, since it is larger than the sum of its proper divisors (8898277001).

20021123223 is a wasteful number, since it uses less digits than its factorization.

20021123223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224569253 (or 2224569250 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20021123223 its reverse (32232112002), we get a palindrome (52253235225).

The spelling of 20021123223 in words is "twenty billion, twenty-one million, one hundred twenty-three thousand, two hundred twenty-three".